Alessandro Solimando created HIVE-26150:
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Summary: OrcRawRecordMerger reads each row twice
Key: HIVE-26150
URL: https://issues.apache.org/jira/browse/HIVE-26150
Project: Hive
Issue Type: Bug
Components: ORC, Transactions
Affects Versions: 4.0.0-alpha-2
Reporter: Alessandro Solimando
OrcRawRecordMerger reads each row twice, the issue does not surface since the
merger is only used with the parameter "collapseEvents" as true, which filters
out one of the two rows.
collapseEvents true and false should produce the same result, since in current
acid implementation, each event has a distinct rowid, so two identical rows
cannot be there, this is the case only for the bug.
In order to reproduce the issue, it is sufficient to set the second parameter
to false
[here|https://github.com/apache/hive/blob/61d4ff2be48b20df9fd24692c372ee9c2606babe/ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcInputFormat.java#L2103-L2106],
and run tests in TestOrcRawRecordMerger and observe two tests failing.
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